Nature of the Strongly Lensed Submillimeter Galaxy SMM J14011+0252

Motohara, Kentaro; Takata, Tadafumi; Iwamuro, Fumihide; Eto, Shigeru; Shima, T.; Mochida, Daisaku; Maihara, Toshinori; Nakanishi, Koichiro; Kashikawa, Nobunari

doi:10.1086/426557

Cited by 10 publications

(16 citation statements)

References 45 publications

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“…Values from the literature are footnoted; un-footnoted values are new. a The amplification for this source has been the subject of several papers; Downes & Solomon (2003) and Motohara et al (2005) argue that an intervening cluster galaxy boosts the amplification to $25. Smail et al (2005) and Smith et al (2005) find that the intervening galaxy is a dwarf with small velocity dispersion and thus contributes only modestly to the total amplification, which they estimate as 3.5 AE 0.5.…”

Section: Sample Selectionmentioning

confidence: 99%

Mid‐Infrared Spectroscopy of Lensed Galaxies at 1 <z< 3: The Nature of Sources Near the MIPS Confusion Limit

Rigby

Marcillac

Egami

et al. 2008

ApJ

129

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We present Spitzer IRS mid-infrared spectra for 15 gravitationally lensed, 24 mYselected galaxies, and combine the results with four additional very faint galaxies with IRS spectra in the literature. The median intrinsic 24 m flux density of the sample is 130 Jy, enabling a systematic survey of the spectral properties of the very faint 24 m sources that dominate the number counts of Spitzer cosmological surveys. Six of the 19 galaxy spectra (32%) show the strong mid-IR continuua expected of AGNs; X-ray detections confirm the presence of AGNs in three of these cases, and reveal AGNs in two other galaxies. These results suggest that nuclear accretion may contribute more flux to faint 24 mYselected samples than previously assumed. Almost all the spectra show some aromatic ( PAH ) emission features; the measured aromatic flux ratios do not show evolution from z ¼ 0. In particular, the high signal-to-noise mid-IR spectrum of SMM J163554.2+661225 agrees remarkably well with low-redshift, lower luminosity templates. We compare the rest-frame 8 m and total infrared luminosities of star-forming galaxies, and find that the behavior of this ratio with total IR luminosity has evolved modestly from z ¼ 2 to z ¼ 0. Since the high aromatic-to-continuum flux ratios in these galaxies rule out a dominant contribution by AGNs, this finding implies systematic evolution in the structure and/or metallicity of infrared sources with redshift. It also has implications for the estimates of star-forming rates inferred from 24 m measurements, in the sense that at z $ 2, a given observed frame 24 m luminosity corresponds to a lower bolometric luminosity than would be inferred from low-redshift templates of similar luminosity at the corresponding rest wavelength.

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Section: Sample Selectionmentioning

confidence: 99%

Mid‐Infrared Spectroscopy of Lensed Galaxies at 1 <z< 3: The Nature of Sources Near the MIPS Confusion Limit

Rigby

Marcillac

Egami

et al. 2008

ApJ

129

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“…SMM J14011+0252 at z = 2.565 (Barger et al 1999) was discovered in the 850 μm SCUBA survey of the A1835 cluster field (Ivison et al 2000), and subsequently detected in CO J = 3-2 line emission by Frayer et al (1999). The lensing amplification factor of this source has been the subject of some debate, and may be as high as ∼25 (Downes & Solomon 2003;Motohara et al 2005;Smail et al 2005;Smith et al 2005), however, in this analysis we adopt a lower factor of 3.5 ) so as to be conservative in our derived luminosity limits in the case of a nondetection. The optical spectral characteristics of this SMG are consistent with that of a starburst galaxy (Frayer et al 1999), while the mid-IR spectrum is also consistent with no AGN being present in this SMG (Rigby et al 2008).…”

Section: Targetsmentioning

confidence: 99%

CONSTRAINTS ON THE PRESENCE OF WATER MEGAMASER EMISSION INz∼ 2.5 ULTRALUMINOUS INFRARED STARBURST GALAXIES

Wagg

Momjian

2009

The Astronomical Journal

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We present Expanded Very Large Array (EVLA) and Arecibo observations of two lensed submillimeter galaxies at z ∼ 2.5, in order to search for redshifted 22.235 GHz water megamaser emission. Both SMM J14011+0252 and SMM J16359+6612 have multi-wavelength characteristics consistent with ongoing starburst activity, as well as CO line emission indicating the presence of warm molecular gas. Our observations do not reveal any evidence for H 2 O megamaser emission in either target, while the lensing allows us to obtain deep limits to the H 2 O line luminosities, L H 2 O < 7470 L (3σ ) in the case of SMM J14011+0252, and L H 2 O < 1893 L for SMM J16359+6612, assuming line widths of 80 km s −1 . Our search for, and subsequent nondetection of, H 2 O megamaser emission in two strongly lensed starburst galaxies rich in gas and dust suggests that such megamaser emission is not likely to be common within the unlensed population of high-redshift starburst galaxies. We use the recent detection of strong H 2 O megamaser emission in the lensed quasar, MG J0414+0534 at z = 2.64 to make predictions for future EVLA C-band surveys of H 2 O megamaser emission in submillimeter galaxies hosting active galactic nuclei.

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“…The majority of our spectroscopic observations were taken with the OH Suppression Spectrograph (OHS; Iwamuro et al 2001) with the Cooled Infrared Spectrograph and Camera for OHS (CISCO; Motohara et al 2002) attached to the Nasmyth focus of Subaru Telescope ( Iye et al 2004). Observations were obtained on the nights of 2004 April 6 and 7, 2004 June 24Y25, and 2005 February 14Y16.…”

Section: Subaru Ohs Observations and Data Reductionmentioning

confidence: 99%

“…Dashed and dot-dashed curves are the division between AGNs and star-forming galaxies defined by Kauffmann et al (2003) and Kewley et al (2001), respectively. We also plot observations of three SMGs from the literature ( Frayer et al 2003;Simpson et al 2004;Motohara et al 2005). Large open circles denote X-rayYdetected SMGs.…”

Section: Extinction and Hidden Star Formationmentioning

confidence: 99%

Rest‐Frame Optical Spectroscopic Classifications for Submillimeter Galaxies

Takata

Sekiguchi

Smail

et al. 2006

ApJ

Self Cite

119

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We report the results of a systematic near-IR spectroscopic survey using the Subaru, VLT, and Keck Telescopes of a sample of high-redshift ULIRGs mainly composed of submillimeter-selected galaxies. Our observations span the rest-frame optical range containing nebular emission lines such as H, [O iii] kk4959, 5007, and [O ii] k3727, which are essential for making robust diagnostics of the physical properties. Using the H/H emission line ratios, we derive internal extinction estimates for these galaxies similar to those of local ULIRGs: A V $ 2:9 AE 0:5. Correcting the H estimates of the star formation rate for dust extinction results in rates that are consistent with those estimated from the far-IR luminosity. The majority (>60%) of our sample show spectral features characteristic of AGNs (although this partially reflects an observational bias), with $65% exhibiting broad Balmer emission lines. A proportion of these sources show relatively low [O iii] k5007 / H line ratios, which are similar to those of narrow-line Seyfert 1 galaxies, suggesting low-mass black holes that are rapidly growing. In the subsample of our survey with both [O iii] k5007 and hard X-ray coverage, at least $60% show an excess of [O iii] k5007 emission, by a factor of 5Y10, relative to the hard X-ray luminosity compared to the correlation between these two properties seen in Seyfert galaxies and QSOs locally. From our spectral diagnostics, we propose that the strong [O iii] k5007 emission in these galaxies arises from shocks in dense gaseous regions. Due to sensitivity and resolution limits, our sample is biased to strong-line emitters and hence our results do not yet provide a complete view of the physical properties of the whole high-redshift ULIRG population.

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Nature of the Strongly Lensed Submillimeter Galaxy SMM J14011+0252

Cited by 10 publications

References 45 publications

Mid‐Infrared Spectroscopy of Lensed Galaxies at 1 <z< 3: The Nature of Sources Near the MIPS Confusion Limit

Mid‐Infrared Spectroscopy of Lensed Galaxies at 1 <z< 3: The Nature of Sources Near the MIPS Confusion Limit

CONSTRAINTS ON THE PRESENCE OF WATER MEGAMASER EMISSION INz∼ 2.5 ULTRALUMINOUS INFRARED STARBURST GALAXIES

Rest‐Frame Optical Spectroscopic Classifications for Submillimeter Galaxies

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