Detection of diffuse interstellar bands in M31

Abstract

We investigate the diffuse interstellar band (DIB) spectrum in the interstellar medium of M31. The DEIMOS spectrograph of the W. M. Keck observatory was used to make optical spectroscopic observations of two supergiant stars, MAG 63885 and MAG 70817, in the vicinity of the OB78 association in M31 where the metallicity is approximately equal to solar. The 5780, 5797, 6203, 6283 and 6613 DIBs are detected in both sightlines at velocities matching the M31 interstellar Na I absorption. The spectra are classified and interstellar reddenings are derived for both stars. Diffuse interstellar band (DIB) equivalent widths and radial velocities are presented. The spectrum of DIBs observed in M31 towards MAG 63885 is found to be similar to that observed in the Milky Way. Towards MAG 70817 the DIB equivalent widths per unit reddening are about three times the Galactic average. Compared to observations elsewhere in the Universe, relative to reddening the M31 ISM in the vicinity of OB78 is apparently a highly favourable environment for the formation of DIB carriers.

References in corpus (13)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• The Leiden/Argentine/Bonn (LAB) Survey of Galactic HI: Final data release of the combined LDS and IAR surveys with improved stray-radiation corrections
• Scattering by Interstellar Dust Grains: Optical and Ultraviolet
• A Survey of Local Group Galaxies Currently Forming Stars. I. UBVRI Photometry of Stars in M31 and M33
• The Diffuse Interstellar Bands: A Major Problem in Astronomical Spectroscopy
• A 2dF survey of the Small Magellanic Cloud
• VLT/UVES Observations of Interstellar Molecules and Diffuse Bands in the Magellanic Clouds
• Diffuse Interstellar Bands in NGC 1448
• Chemical composition of B-type supergiants in the OB8, OB10, OB48, OB78 associations of M31
• Characteristics and classification of A-type supergiants in the Small Magellanic Cloud
• Detection of Diffuse Interstellar Bands in the z=0.5 Damped Lyman alpha system towards AO 0235+164
• Diffuse Interstellar Bands in z < 0.6 CaII Absorbers
• STIS UV spectroscopy of early B supergiants in M31

Cited by in corpus (30)

• Diffuse interstellar bands in Upper Scorpius: Probing variations in the DIB spectrum due to changing environmental conditions
• Diffuse interstellar bands in RAVE Survey spectra
• A Spectroscopic Survey of Massive Stars in M31 and M33
• A survey of diffuse interstellar bands in the Andromeda galaxy: optical spectroscopy of M31 OB stars
• Interstellar atoms, molecules and diffuse bands toward SN2006X in M100
• Diffuse Interstellar Bands vs. Known Atomic and Molecular Species in the Interstellar Medium of M82 toward SN 2014J
• The Gaia-ESO Survey: Extracting diffuse interstellar bands from cool star spectra, DIB-based interstellar medium line-of-sight structures at the kpc scale
• A Tale of Two Mysteries in Interstellar Astrophysics: The 2175 Angstrom Extinction Bump and Diffuse Interstellar Bands
• Quantitative spectroscopy of Galactic BA-type supergiants. I. Atmospheric parameters
• Diffuse interstellar band at 8620 Å in RAVE: A new method for detecting the diffuse interstellar band in spectra of cool stars
• Dusting off the diffuse interstellar bands: DIBs and dust in extragalactic SDSS spectra
• Automated measurements of diffuse interstellar bands in early-type star spectra Correlations with the Color Excess
• Detections of Diffuse Interstellar Bands in the SDSS Low-resolution Spectra
• Linear/circular spectropolarimetry of diffuse interstellar bands
• Interaction Between The Broad-lined Type Ic Supernova 2012ap and Carriers of Diffuse Interstellar Bands
• Near-infrared diffuse interstellar bands in APOGEE telluric standard star spectra: weak bands and comparisons with optical counterparts
• Limits on Reddening and Gas-to-Dust Ratios for Seven Intermediate Redshift Damped Ly-alpha Absorbers from Diffuse Interstellar Bands
• A catalog of 1.5273 micron diffuse interstellar bands based on APOGEE hot telluric calibrators
• Quantitative spectroscopy of B-type supergiants
• Using machine learning to classify the diffuse interstellar bands
• CRIRES high-resolution near-infrared spectroscopy of diffuse interstellar band profiles. Detection of 12 new DIBs in the YJ band and the introduction of a combined ISM sight line and stellar analysis approach
• Dense molecular clouds in the SN2008fp host galaxy
• Diffuse interstellar bands λ5780 and λ5797 in the Antennae Galaxy as seen by MUSE
• Probing the Local Bubble with Diffuse Interstellar Bands. II. The DIB properties in the Northern hemisphere
• Probing the Local Bubble with Diffuse Interstellar Bands. III. The Northern hemisphere data and catalog
• Probing the Missing Link between the Diffuse Interstellar Bands and the Total-to-Selective Extinction Ratio $R_V$ $-$ I. Extinction versus Reddening
• The Interstellar Line of Sight to the Interacting Galaxy NGC 5195
• Measuring the Diffuse Interstellar Bands at 5780, 5797, and 6614 Å in Low-Resolution Spectra of Cool Stars from LAMOST
• Diffuse interstellar bands in M33
• The EDIBLES survey. X. The 6196 Å diffuse interstellar band: Identification of side DIBs as an indication of a small carrier molecule