New Herbig–Haro objects and outflows in the Mon R1 association

Abstract

We present the results of a narrow-band Hα and [S ii] imaging survey of the Mon R1 association performed with the 1-m Schmidt telescope at Byurakan Observatory. Our observations covered a 1° field near the centre of the association. As a result of this study, 20 new Herbig–Haro knots were discovered, some of which form collimated outflows. Among the most extended ones are HH 1203 and HH 1196, which have a length of 1 pc or even more. During the search for the probable sources of HH objects, several new nebulous stars were found. A list of all nebulous stellar objects in the Mon R1 area under study is presented, with detailed descriptions of the most interesting ones. The near-infrared data from the GLIMPSE360 and WISE surveys revealed several more objects related to Mon R1, some of which had optical counterparts, as well as helped to identify at least three probable H2 collimated flows from the deeply embedded pre-main-sequence objects. The probable members of Mon R1 were selected by their distances; their bolometric luminosities and extinctions were estimated. Among the outflow sources, three embedded objects with luminosities greater than 10 L⊙ were found. The mean distance to the Mon R1 complex is estimated as 715 pc.

Near-infrared detection of H$_2$ flows in the core of Mon R1 association

“…As was mentioned above, several HH groups and HH flows were found in the six areas of Mon R1 and described in the our previous paper (Movsessian, Magakian & Dodonov 2021). It is worth mentioning that none of these areas is located in the field, studied here, and, besides, none of these groups shows obvious traces of H2 emission at least in WISE or GLIMPSE360 surveys.…”

“…1 we show the general view of that part of Mon R1, where the suspected H2 flows were found. All of them are located in a very dense area, seen to the west from NGC 2247 nebula, near IRAS 06297+1021 (W) and (E) sources (see for details Movsessian, Magakian & Dodonov 2021).…”

“…In Table 1 we present the approximate coordinates of the centers of all four flows and their projected lengths in parsecs. We assumed 715 pc for the distance of Mon R1 association (see Movsessian, Magakian & Dodonov 2021, for the further details). As one can see, visible sizes of the flows correspond to significant lengths -up to nearly half of parsec.…”

“…In our previous paper (Movsessian, Magakian & Dodonov 2021) we described the results of a search of Herbig-Haro (HH) objects in the field, centered on the three brightest nebulae NGC 2245, NGC 2247 and IC 446 in the Mon R1 association. Many new HH flows and their probable sources were found, significantly increasing the number of YSOs in Mon R1.…”

Narrow band imaging survey of dark clouds

“…In frames of BNBIS in the Mon R1 were discovered several new HH objects as well as two collimated outflow systems, one form which belongs to giant HH outflows with size of 1.6pc. Detailed description of newly discovered HH objects and outflow systems can be found in Movsessian, Magakian, & Dodonov (2021). Narrow band image, which is covering one square degree field of Mon R1 region with newly discovered HH objects, is shown on the Fig.…”